Corrigendum to “Prevalence of Corneal Astigmatism in Patients before Cataract Surgery in Western China” - Wei Ma; Chengguo Zuo; Weirong Chen; Shaoyang Zheng; Jiangang Xu; Ruowen Gong; Maierhaba Mijiti; Kaidiliya Alifu; Lin Ding; Mingkai Lin (Journal of Ophthalmology)